Pulley.



J B D U N L I A P.

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JOSEPH B. DUNLAP, OF TULSA, INDIAN TERRITORY.

PULLEY.

Specification of Letters Patent.

Patented May '7, 1907.

Application filed April 20, 1906. Serial No. 312,802.

To all whom it may concern.-

Be it known that I, JosEPH B. DUNLAP, a citizen of the United States,and a resident of Tulsa, in the Creek Nation, Indian Territory, haveinvented anew and Improved Pulley, of which the following is aspecification.

My invention relates more particularly to drive pulleys for shafting,but comprehends the general subject of gear-wheels and similar drivingor driven devices.

The invention is directed to the pulley or gear-wheel fastening meansand also to a peculiar construction of a two-part hub.

The invention consists, more definitely stated, of the novelconstruction shown by the accompanying drawing and hereinafter fullydescribed.

In the drawing Figure 1 is a view illustrating my invention in sideelevation. Figs.

2 and 3 are edge or plan views, illustrating two detached half-portionsof a divided pulley. Fig. 4 shows perspective views of the pulleyfastenings, bushings, or keys, and Fig.- 5 is an enlarged transversesectional view through my improved two-part hub and its fastening means.

In the preferred form of my invention I employ'a divided pulley,consisting of two similar interchangeable portions A and B, the bore orshaft opening 0 through the hubs being fashioned in peculiar form aswill appear further on.

In the makeup of my invention I employ two keys D, having inner curvedsides, and outer sides made cam shape from one longitudinal edge to theother, or gradually thickened transversely substantially as shown, intowedge form.

The opening C through the hub may be defined as being formed by curvedwalls, or segments of circles E, described from laterally separatedpoints of center.

In further carrying out my invention I provide the inner or flat side ofone hub portion B with a transversely arranged dovetail tongue F, madetapering from end to end,

' and similar shaped and arranged groove I.

The other portion of the hub A is likewise provided with a tongue II anda groove G, both corresponding in form to the tongue and groove F, I,and are adapted in assembling the two parts of the hub, for the tonguesto be entered into the grooves and the secstood.

Other fastening means such as perforated lugs and securing boltsindicated at J, are also provided in the makeup of my invention, but assame will be readily understood, detail description thereof is deemedunnecessary.

The construction of my invention will be understood from the abovedescription.

My invention involves novelty in that it obviates the necessity ofboring, smoothing or otherwise finishing the shaft opening through thehub, thereby adapting the parts for ready use, directly after casting ofthe parts.

In the use of my invention the pulley is arranged on its supportingshaft and the keys D driven into place, in the are shaped spaces formedinside the shaft opening through the hub. Now it is obvious that whenthe pulley is forwardly rotated indicated by the arrow in Fig. 5, theouter surfaces of the keys will be engaged by cam acting surfaces,formed by the cylindrical shaped surfaces E in the bore of the hub, andthrough wedging action clamp the keys against the shaft, thereby securethe pulley against rotation on the shaft.

In some instances it may be necessary to upset a slight bur K on thepulley shaft, for use as' an obstruction to sliding action of the keys,upon starting the pulley, and same may be made with a suitable chisel,as will be understood.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is In combination, a hub constructed in twointerchangeable parts and with a shaft opening therethrough, there beinga dove-tail tongue, and a similar shaped groove, in the adjacent sidesof the hub parts, the tongue on one part being adapted for interlockingengagement with the groove on the other part, curved keys in the shaftopening, constructed with cam acting outer surfaces, and a shaftprovided with a bur adapted to operatively engage the curved keys.

JOSEPH B. DUNLAP.

Witnesses:

HENRY M. PRICE, W. I. RENEAU.

